Rwa asking for Monthly Charges in Private colony

Hi all, I have a query regarding RWA authorities in private colonies. In our colony some people combined formed a RWA Association and got it registered. The area is a private colony with individual built houses. These ppl asked residents to pay for contribution to put gate on colony entrance and cctv for safety purpose which residents agreed to and paid. Now they have registered their association and asking for forced monthly payouts which everyone in the colony is not capable to pay. some ppl are paying but not all. My mother is sr citizen and getting pension and she cannot pay these monthly charges on regular basis. my brother also stays withmy mother but he just give for the water and electricity bill charges to my mom. The Rwa has started sending legal notice through speed post. Can anyone please confirm what my mother can do to handle this situation as she is not capable of paying these charges as she dont have ant source of income except widow pension and property is on the name of my mom.